CN1744179A - Organic electro-luminescence display device and method of driving the same - Google Patents

Organic electro-luminescence display device and method of driving the same Download PDF

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Publication number
CN1744179A
CN1744179A CNA2005100996403A CN200510099640A CN1744179A CN 1744179 A CN1744179 A CN 1744179A CN A2005100996403 A CNA2005100996403 A CN A2005100996403A CN 200510099640 A CN200510099640 A CN 200510099640A CN 1744179 A CN1744179 A CN 1744179A
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data
current
charge
digital
charge current
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CN100435198C (en
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河元奎
金学洙
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Neo Lab Convergence Inc.
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LG Electronics Inc
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3216—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using a passive matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/06—Passive matrix structure, i.e. with direct application of both column and row voltages to the light emitting or modulating elements, other than LCD or OLED
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0248—Precharge or discharge of column electrodes before or after applying exact column voltages
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/025—Reduction of instantaneous peaks of current
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The present invention relates to an organic electro-luminescence display device and a method of driving the same that is adaptive for reducing power consumption by removing an unnecessary current as well as for improving a uniformity of a display screen. An organic electro-luminescence display device according to an embodiment of the present invention includes a display panel in which a plurality of data lines and a plurality of scan lines cross each other and electro-luminescence elements are arranged at the crosses. A pre-charge driver, which detects a gray level of digital video data to be realized at a Nth during discharge period when a data current corresponding to a gray level of digital video data to be realized at a (N-1)th calculates a pre-charge current corresponding to the detected gray level of digital video data to supply the calculated pre-charge current to the electro-luminescence elements. A data driver supplies data to the electro-luminescence elements charged with the pre-charge current during a pre-charge period; and a scan driver supplies a scan pulse, synchronized with the data, to the scan lines.

Description

Organic electro-luminescence display device and driving method thereof
The application requires the rights and interests of the korean patent application No.P2004-68460 that submits on August 30th, 2004, and it is comprised and as a reference fully at this.
Technical field
The present invention relates to a kind of organic electro-luminescence display device, and more specifically, relate to a kind of organic electro-luminescence display device and driving method thereof, this equipment is suitable for by removing the homogeneity that unwanted electric current reduces power consumption and improves display screen.
Background technology
Recently, developed the littler multiple flat-panel monitor of weight and volume, it does not have the shortcoming of cathode-ray tube CRT.This flat-panel monitor comprises LCD LCD, Field Emission Display FED, Plasmia indicating panel PDP and electroluminescence (hereinafter, being called EL) display device.
In these flat-panel monitors, the structure of PDP is relative with manufacture process simple.Therefore, have the advantage that is fabricated to large-sized PDP, but its shortcoming is luminescence efficiency and brightness is low and the power consumption height.
LCD is as the display device of notebook, and its demand increases gradually.But because use semiconductor technology, LCD is difficult to be manufactured to large scale, and LCD is because be not light emitting device, and it needs independent light source.Therefore, the shortcoming of LCD is because independent light source and power consumption height.In addition, the shortcoming of LCD is the high optical loss that it is caused by the optical device such as polarisation filter, prism thin slice and diffuser panel, and its narrow viewing angle.
The EL display device is classified as inorganic EL display device and organic EL display apparatus usually.The advantage of this EL display device is that its response speed is fast, luminescence efficiency and brightness height, and the visual angle is wide.Organic EL display apparatus can be with about 10[V] voltage show several ten thousand [cd/m 2] the image of brightness, therefore be applied to most normally used EL display devices.
In the unit element of organic EL display apparatus, as shown in Figure 1, anode 2 is formed on substrate 1 by transparent conductive material; And hole injection layer 3 is set, the luminescent layer of making by organic material 4 and thereon by metal negative electrode 5 with low work content.If electric field is added between anode 2 and the negative electrode 5, hole in hole injection layer 3 and the electronics in metal advance to luminescent layer 4 so, with compound each other in luminescent layer 4.Then, thus the fluorescent material in luminescent layer 4 is excited and transition produces visible light.Under this situation, brightness is directly proportional with electric current between anode 2 and negative electrode 5.
This organic EL display apparatus is classified as passive type and Source Type is arranged.
Fig. 2 is the circuit diagram that shows the part of passive type organic EL display apparatus equivalently, and Fig. 3 shows the oscillogram of the waveform of sweep signal in the passive type organic EL display apparatus and data-signal.
With reference to figure 2 and 3, passive type EL display device comprises and is arranged in a plurality of data line D1-D3 intersected with each other and the organic EL OLED of the point of crossing between a plurality of sweep trace S1-S3, and a plurality of data line D1-D3 intersected with each other and a plurality of sweep trace S1-S3.
Data line D1-D3 is connected with the anode of organic EL OLED, so that data current Id to be provided the anode to organic EL OLED.
Sweep trace S1-S3 is connected with the negative electrode of organic EL OLED, so that the negative electrode to organic EL OLED with the synchronous scanning impulse SP1-SP3 of data current Id to be provided.
When anode 2 and negative electrode 5 apply scanning impulse SP1-SP3, luminous on the ground that is directly proportional with the electric current that between anode 2 and negative electrode 5, flows of organic EL OLED during the display cycle DT.During response time RT, organic EL by the electric current OLED that charges, is made the problem that has low-response speed and low-light level by the resistive component of data line D1-D3 and the capacitance delays that in organic EL OLED, exists.In order to compensate the low-response speed of organic EL OLED, present trend is among non-display cycle DCHA between display cycle DT and display cycle DT and the PCHA precharge cycle PCHA to be set, as shown in Figure 4, and during precharge cycle PCHA to organic EL OLED precharge.
But, in the precharge driving method of prior art, provide the maximum data electric current at precharge cycle PCHA and do not consider during display cycle DT, to be added to the gray-scale value of the data of organic EL OLED through data line D1-D3, and during display cycle DT, will be provided to organic EL OLED then corresponding to the data current of data gray-scale value.Therefore,, provide the data current that hangs down gray level to organic EL OLED, produce overshoot so, and be delayed the demonstration time of organic EL OLED through data line D1-D3 if during display cycle DT.In addition, because be provided to the unwanted electric current of organic EL OLED through data line D1-D3 during precharge cycle PCHA in low gray level, organic EL OLED is overcharged.Therefore, there is the problem that power consumption increases in the organic EL display apparatus.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of organic electro-luminescence display device and drive the method for this equipment, it is suitable for by removing the homogeneity that unwanted electric current reduces power consumption and is used to improve display screen.
In order to realize these and other objects of the present invention, comprise according to the organic electro-luminescence display device of the embodiment of the invention: display panel, wherein a plurality of data lines and a plurality of sweep trace are intersected with each other, and arrange electroluminescent cell in the point of crossing; Pre-charge driver, it detects the gray level of the digital of digital video data of realizing at N when corresponding to the data current of the gray level of the digital of digital video data of realizing at N-1, and calculate pre-charge current corresponding to the gray level of the digital of digital video data that detects, with pre-charge current that calculating is provided to electroluminescent cell; Data driver, it is used to provide data to the electroluminescent cell with the pre-charge current charging; And scanner driver, it is used to provide scanning impulse with data sync to sweep trace.
This pre-charge driver provides the pre-charge current with the level that differs from one another to organic electroluminescent device according to the gray level of digital of digital video data.
This pre-charge driver comprises: data converter, and its grey level transition that is used for the digital of digital video data that will realize is an analog current; With the pre-charge current counter, it is used for calculating the pre-charge current corresponding to the analog current of changing at data converter.
Pre-charge current is that the electric current as the data that will realize multiply by the maximal value of pre-charge current and the result's that obtains divided by the maximal value of data current afterwards value.
A kind of method of the driving organic electro-luminescence display device according to the embodiment of the invention is provided, a plurality of data lines and a plurality of sweep trace are intersected with each other and arrange electroluminescent cell in the point of crossing in this organic electro-luminescence display device, method according to the embodiment of the invention comprises: when the N-1 data current is discharged, detect the gray level of the digital of digital video data of realizing at N; With the grey level transition of the digital of digital video data that detects be analog current corresponding to the level of the gray level of the digital of digital video data of detection; Calculate pre-charge current by the analog current that uses conversion; Provide the pre-charge current of calculating to electroluminescent cell through data line; And provide data to electroluminescent cell with pre-charge current charging.
The step of calculating pre-charge current comprise will conversion analog current multiply by the maximal value of pre-charge current and then divided by the maximal value of data current.
Description of drawings
Can be more clear by detailed description to these and other objects of the present invention below with reference to the embodiments of the invention of accompanying drawing, in the accompanying drawings:
Fig. 1 is the schematic sectional view of unit element of the organic electro-luminescence display device of prior art;
Fig. 2 is the equivalent circuit diagram of a part of the organic EL display apparatus of passive type;
Fig. 3 shows the oscillogram of the response time delay that produces in the driving method of the organic EL display apparatus of prior art;
Fig. 4 shows the oscillogram of the precharge driving method of prior art;
Fig. 5 shows the view according to the organic electro-luminescence display device of the embodiment of the invention;
Fig. 6 shows the view of the pre-charge driver of Fig. 5; And
Fig. 7 shows the oscillogram according to the driving method of the organic electro-luminescence display device of the embodiment of the invention.
Embodiment
Below in detail with reference to the preferred embodiments of the present invention, the example shown in the drawings.
Hereinafter, will describe the preferred embodiments of the present invention in detail with reference to figure 5-7.
Fig. 5 shows the view of organic electroluminescent (EL) display device according to the embodiment of the invention.
With reference to figure 5, comprise according to the organic EL display apparatus of the embodiment of the invention: display panel 20, wherein arrange m * n organic EL OLED with matrix-type; Data driver 24, it is used to produce data current; Scanner driver 26, it is used to produce the scanning impulse synchronous with data current; And pre-charge driver 22, it is used for calculating pre-charge current according to the gray level of digital of digital video data R, G and B, with pre-charge current that calculating is provided to organic EL OLED.
In display panel 20, m data line D1-Dm and n sweep trace S1-Sn are intersected with each other, and arrange organic EL OLED between the point of crossing.
Data driver 24 comprises the shift register circuit that is used for sampled data sequentially and such as the current source of current mirror circuit or electric current synchronizing circuit.This data driver 24 sampled digital video data R, G and B, and provide data current corresponding to the gray-scale value of digital of digital video data R, G and B to data line D1-Dm through pre-charge driver 22 then.
Scanner driver 26 comprises the shift register circuit, its be used for sequentially being shifted scanning impulse with sequentially provide with the synchronous scanning impulse of data current to sweep trace S1-Sn.
During precharge cycle, pre-charge driver 22 detects the gray level of the data that realize at N-1, just, when corresponding to the data current discharge of the gray level of data, the gray level of the data that realize at N, and calculate pre-charge current to be supplied to organic EL OLED through data line D1-Dm according to the gray level of the data that detect.In addition, during the display cycle, pre-charge driver 22 provides the data current that applies from data driver 24 to data line D1-Dm.Like this, as shown in Figure 6, pre-charge driver 22 comprises: data converter 28, and it is used for digital of digital video data R, G and B are converted to analog current; With pre-charge current counter 30, it is used for calculating pre-charge current according to the analog current in data converter 28 conversions.
As shown in Figure 7, when corresponding to the time by the data current discharge of the gray level of the data that realize at the N-1 scanning impulse SPn-1 of N-1, digital of digital video data R, G that data converter 28 detections realize at N during discharge cycle DCHA and the gray-scale value of B, and then digital of digital video data R, the G of detection and the gray-scale value of B are converted to analog current.For example, maximum gray scale value at digital of digital video data R, G and B is that 64 gray scales and maximum data electric current are under the situation of 64 μ A, and data converter 28 is converted to the gray-scale value of the digital of digital video data R, the G that detect and B the analog current of any one level with 1 μ A-64 μ A scope.
During precharge cycle PCHA, when from data converter 28 when pre-charge current counter 30 provides analog current value, it calculates pre-charge current by using formula 1, and provides pre-charge current to organic EL OLED then.For example, if maximum pre-charge current is 256 μ A, and digital of digital video data R, the G that will realize at N and the gray-scale value of B be 32 gray scales, and the analog current value that is provided to pre-charge current counter 30 from data converter 28 is 32 μ A so.Therefore, during precharge cycle PCHA, pre-charge current counter 30 provides the pre-charge current of the 128 μ A that calculated by formula 1 to organic EL OLED through data line D1-Dm.Under this situation, the maximal value of the pre-charge current that provides from pre-charge current counter 30 has and the identical size of data current that is provided to data line D1-Dm among N display cycle DT by N scanning impulse SPn.This pre-charge current counter 30 provides the pre-charge current that has different level each other to organic EL OLED according to the analog current value that provides from data converter 28.
Formula 1
Figure A20051009964000101
In organic EL display apparatus and driving method thereof according to the embodiment of the invention, when the data current corresponding to the gray-scale value of N-1 digital of digital video data R, G and B is discharged, in discharge cycle DCHA, detect the gray-scale value of N digital of digital video data R, G and B, and will be provided to organic EL OLED corresponding to the pre-charge current of the gray-scale value of N digital of digital video data R, G and B then.Therefore, because unwanted electric current does not flow in low gray level, can reduce the power consumption of organic EL display apparatus.In addition, because prevented overshoot, can prevent overcharging and response time delay of organic EL OLED.Therefore, can improve the homogeneity of the same grayscale performance on the same scan line S1-Sn of display panel 20.
Simultaneously, based on organic EL display apparatus and the driving method thereof of passive type description according to the embodiment of the invention, but it also can be applied to the known organic electro-luminescence display device that Source Type is arranged arbitrarily.
As mentioned above, in organic EL display apparatus and driving method thereof according to the embodiment of the invention, when corresponding to the data current discharge of the gray-scale value of N-1 digital of digital video data R, G and B, in discharge cycle DCHA, detect the gray-scale value of N digital of digital video data, and will be provided to organic EL OLED corresponding to the pre-charge current of the gray-scale value of N digital of digital video data then.Therefore, because unwanted electric current does not flow in low gray level, can reduce the power consumption of organic EL display apparatus.In addition, because prevented overshoot, can prevent overcharging and response time delay of organic EL OLED.Therefore, can improve the homogeneity of the same grayscale performance on the same scan line of display panel.
Though explained the present invention by the embodiment shown in the aforesaid accompanying drawing, it should be understood by one skilled in the art that to the invention is not restricted to these embodiment, but under the situation that does not break away from spirit of the present invention, can make multiple modification or change.Therefore, scope of the present invention should only be determined by appended claim and equivalent thereof.

Claims (6)

1. organic electro-luminescence display device, it comprises:
Display panel, wherein a plurality of data lines and a plurality of sweep trace are intersected with each other, and arrange electroluminescent cell in the point of crossing;
Pre-charge driver, it detects the gray level of the digital of digital video data of realizing at N when corresponding to the data current of the gray level of the digital of digital video data that will realize at N-1, and calculate pre-charge current corresponding to the gray level of the digital of digital video data that detects, with pre-charge current that calculating is provided to electroluminescent cell;
Data driver, it is used to provide data to the electroluminescent cell with the pre-charge current charging; With
Scanner driver, it is used to provide scanning impulse with data sync to sweep trace.
2. organic electro-luminescence display device as claimed in claim 1, wherein, this pre-charge driver provides the pre-charge current with the level that differs from one another to organic electroluminescent device according to the gray level of digital of digital video data.
3. organic electro-luminescence display device as claimed in claim 1, wherein, this pre-charge driver comprises:
Data converter, its grey level transition that is used for the digital of digital video data that will realize is an analog current; With
The pre-charge current counter, it is used for calculating the pre-charge current corresponding to the analog current of changing at data converter.
4. organic electro-luminescence display device as claimed in claim 1, wherein, this pre-charge current is that the electric current as the data that will realize multiply by the maximal value of pre-charge current and the result's that obtains divided by the maximal value of data current then value.
5. method that drives organic electro-luminescence display device, a plurality of data lines and a plurality of sweep trace are intersected with each other in this organic electro-luminescence display device, and arrange electroluminescent cell in the point of crossing, and this method comprises:
When the N-1 data current is discharged, detect the gray level of the digital of digital video data of realizing at N;
With the grey level transition of the digital of digital video data that detects be analog current corresponding to the level of the gray level of the digital of digital video data of detection;
Calculate pre-charge current by the analog current that uses conversion;
Provide the pre-charge current of calculating to electroluminescent cell by data line; And
Provide data to electroluminescent cell with the pre-charge current charging.
6. method as claimed in claim 5, wherein, the step of this calculating pre-charge current comprise will conversion analog current multiply by the maximal value of pre-charge current and then divided by the maximal value of data current.
CNB2005100996403A 2004-08-30 2005-08-30 Organic electro-luminescence display device and method of driving the same Expired - Fee Related CN100435198C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020040068460A KR100826684B1 (en) 2004-08-30 2004-08-30 Organic electro-luminescence display device and method of driving the same
KR1020040068460 2004-08-30
KR10-2004-0068460 2004-08-30

Publications (2)

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CN100435198C (en) 2008-11-19
KR100826684B1 (en) 2008-05-02
KR20060019800A (en) 2006-03-06
EP1630777A2 (en) 2006-03-01
JP2006072362A (en) 2006-03-16

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